<?php $a1 = [ "a" => 2, "b" => 0, "c" => 5, ]; $a2 = [ "a" => 3, "b" => 9, "c" => 7, "d" => 10, ]; $a3 = [ 'b' => 5, 'e' => 10, ]; var_export( array_map( fn($v) => array_sum((array) $v), array_merge_recursive($a1, $a2, $a3) ) );
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